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+# ===============================================================================
+#  DESCRIPTION: Perl Weekly Challenge #121
+#               Task 1 - Invert bit
+#
+#       AUTHOR: Lubos Kolouch
+#      CREATED: 20210710 04:44:33 PM
+# ===============================================================================
+
+
+def invert_bit(what: int, n: int):
+
+    binary_what = str(bin(what)[2:])
+
+    binary_arr = list(binary_what)
+    binary_arr[-n] = '0' if binary_arr[-n] == '1' else '1'
+    return int("".join(binary_arr), 2)
+
+
+assert invert_bit(12, 3) == 8
+assert invert_bit(18, 4) == 26